Fiddler not getting traffic on a Windows service on newer OSs

7 posts, 0 answers
  1. Daniel
    Daniel avatar
    5 posts
    Member since:
    Feb 2019

    Posted 14 Feb 2019 Link to this post

     

    I have a Windows service that is sending encrypted HTTP traffic.  I have set up Fiddler to decrypt  HTTPS traffic. I have logged in as the user whom this service is set to log in as. Though the service is creating traffic, I'm getting no traffic in Fiddler.

    This seems to be happening on Windows 2016 servers. I have a Windows 2008 server on which the same service is running and I'm getting traffic just fine.  Does anyone know what might be the issue?

  2.
  3. Alexander
    Admin
    Alexander avatar
    383 posts

    Posted 25 Feb 2019 Link to this post

    Hi,

    Does Fiddler capture any traffic (browser, other applications, etc.)?

    Regards,
    Alexander
    Progress Telerik
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  5. Daniel
    Daniel avatar
    5 posts
    Member since:
    Feb 2019

    Posted 25 Feb 2019 in reply to Alexander Link to this post

    Yes it does. It will capture traffic from a browser if I have one running on it.
  7. Alexander
    Admin
    Alexander avatar
    383 posts

    Posted 01 Mar 2019 Link to this post

    Hello,

    It's possible that the service on the newer system is using WinHTTP instead of WinINET (this is what Fiddler is attached as proxy by default). You can find instructions how to set the WinHTTP proxy settings in this forum reply. Does this fix it?

    Regards,
    Alexander
    Progress Telerik
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  9. Daniel
    Daniel avatar
    5 posts
    Member since:
    Feb 2019

    Posted 01 Mar 2019 in reply to Alexander Link to this post

    I performed the command as mentioned but still get no traffic from the service. 
  11. Daniel
    Daniel avatar
    5 posts
    Member since:
    Feb 2019

    Posted 01 Mar 2019 in reply to Daniel Link to this post

    I performed the steps mentioned here and now I get my traffic. Thanks!

     

    https://www.telerik.com/blogs/capturing-traffic-from-.net-services-with-fiddler

  13. Daniel
    Daniel avatar
    5 posts
    Member since:
    Feb 2019

    Posted 01 Mar 2019 in reply to Daniel Link to this post

    I performed the steps here https://www.telerik.com/blogs/capturing-traffic-from-.net-services-with-fiddler

    and now I get my traffic.

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